2 * fs/sysfs/sysfs.h - sysfs internal header file
4 * Copyright (c) 2001-3 Patrick Mochel
5 * Copyright (c) 2007 SUSE Linux Products GmbH
6 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
8 * This file is released under the GPLv2.
11 #include <linux/lockdep.h>
12 #include <linux/kobject_ns.h>
14 #include <linux/rbtree.h>
16 struct sysfs_open_dirent;
18 /* type-specific structures for sysfs_dirent->s_* union members */
19 struct sysfs_elem_dir {
20 unsigned long subdirs;
21 /* children rbtree starts here and goes through sd->s_rb */
22 struct rb_root children;
25 struct sysfs_elem_symlink {
26 struct sysfs_dirent *target_sd;
29 struct sysfs_elem_attr {
30 struct sysfs_open_dirent *open;
33 struct sysfs_inode_attrs {
34 struct iattr ia_iattr;
40 * sysfs_dirent - the building block of sysfs hierarchy. Each and
41 * every sysfs node is represented by single sysfs_dirent.
43 * As long as s_count reference is held, the sysfs_dirent itself is
44 * accessible. Dereferencing s_elem or any other outer entity
45 * requires s_active reference.
50 #ifdef CONFIG_DEBUG_LOCK_ALLOC
51 struct lockdep_map dep_map;
53 struct sysfs_dirent *s_parent;
59 struct completion *completion;
60 struct sysfs_dirent *removed_list;
63 const void *s_ns; /* namespace tag */
64 unsigned int s_hash; /* ns + name hash */
66 struct sysfs_elem_dir s_dir;
67 struct sysfs_elem_symlink s_symlink;
68 struct sysfs_elem_attr s_attr;
73 unsigned short s_flags;
76 struct sysfs_inode_attrs *s_iattr;
79 #define SD_DEACTIVATED_BIAS INT_MIN
81 #define SYSFS_TYPE_MASK 0x00ff
82 #define SYSFS_DIR 0x0001
83 #define SYSFS_KOBJ_ATTR 0x0002
84 #define SYSFS_KOBJ_BIN_ATTR 0x0004
85 #define SYSFS_KOBJ_LINK 0x0008
86 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
87 #define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
89 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
90 #define SYSFS_FLAG_NS 0x01000
91 #define SYSFS_FLAG_REMOVED 0x02000
93 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
95 return sd->s_flags & SYSFS_TYPE_MASK;
98 #ifdef CONFIG_DEBUG_LOCK_ALLOC
100 #define sysfs_dirent_init_lockdep(sd) \
102 struct attribute *attr = sd->priv; \
103 struct lock_class_key *key = attr->key; \
107 lockdep_init_map(&sd->dep_map, "s_active", key, 0); \
110 /* Test for attributes that want to ignore lockdep for read-locking */
111 static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
113 struct attribute *attr = sd->priv;
114 int type = sysfs_type(sd);
116 return (type == SYSFS_KOBJ_ATTR || type == SYSFS_KOBJ_BIN_ATTR) &&
117 attr->ignore_lockdep;
122 #define sysfs_dirent_init_lockdep(sd) do {} while (0)
124 static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
132 * Context structure to be used while adding/removing nodes.
134 struct sysfs_addrm_cxt {
135 struct sysfs_dirent *removed;
143 * Each sb is associated with one namespace tag, currently the network
144 * namespace of the task which mounted this sysfs instance. If multiple
145 * tags become necessary, make the following an array and compare
146 * sysfs_dirent tag against every entry.
148 struct sysfs_super_info {
151 #define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
152 extern struct sysfs_dirent sysfs_root;
153 extern struct kmem_cache *sysfs_dir_cachep;
158 extern struct mutex sysfs_mutex;
159 extern spinlock_t sysfs_symlink_target_lock;
160 extern const struct dentry_operations sysfs_dentry_ops;
162 extern const struct file_operations sysfs_dir_operations;
163 extern const struct inode_operations sysfs_dir_inode_operations;
165 struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
166 void sysfs_put_active(struct sysfs_dirent *sd);
167 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt);
168 void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name);
169 int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
170 struct sysfs_dirent *parent_sd);
171 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
172 struct sysfs_dirent *parent_sd);
173 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
175 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
176 const unsigned char *name,
178 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
180 void release_sysfs_dirent(struct sysfs_dirent *sd);
182 static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
185 WARN_ON(!atomic_read(&sd->s_count));
186 atomic_inc(&sd->s_count);
190 #define sysfs_get(sd) __sysfs_get(sd)
192 static inline void __sysfs_put(struct sysfs_dirent *sd)
194 if (sd && atomic_dec_and_test(&sd->s_count))
195 release_sysfs_dirent(sd);
197 #define sysfs_put(sd) __sysfs_put(sd)
202 struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd);
203 void sysfs_evict_inode(struct inode *inode);
204 int sysfs_permission(struct inode *inode, int mask);
205 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
206 int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
208 int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
209 size_t size, int flags);
210 int sysfs_inode_init(void);
215 extern const struct file_operations sysfs_file_operations;
216 extern const struct file_operations sysfs_bin_operations;
218 int sysfs_add_file(struct sysfs_dirent *dir_sd,
219 const struct attribute *attr, int type);
221 int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
222 const struct attribute *attr, int type,
223 umode_t amode, const void *ns);
224 void sysfs_unmap_bin_file(struct sysfs_dirent *sd);
229 extern const struct inode_operations sysfs_symlink_inode_operations;
230 int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,